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d14cbb1bd7
Allow Delta Chat core to work with chatmail servers running on underscore-prefixed domains (e.g. _alice.localchat) which use self-signed TLS certificates. This is mirroring related work on chatmail relays: https://github.com/chatmail/relay/pull/855 Underscore domains with self-signed TLS certs can be used by LXC test containers where obtaining real certificates is not practical. When the domain starts with '_', certificate verification is automatically relaxed for IMAP/SMTP connections, dcaccount QR code handling, and iroh relay endpoints. The Python test suite is adapted to also work against such underscore-domain servers, including cross-core tests with older Delta Chat versions. Note: this PR does not support HTTPS requests with underscore domains. They are not currently needed for working with LXC test containers. 14 files changed, +102/-31 lines (excluding Cargo.lock). Cargo.lock: +606/-11 lines from enabling iroh features needed for connecting to iroh relay endpoint on underscore domains. The added dependencies are unfortunate but best considered when finally upgrading to iroh 1.0 (tm).